134 PROCEEDINGS OF THE [Mai'ch, 1887. 



Kaiserliclie Akademie der Wissenscliaf ten, Wien : Sitszimgsbe- 

 richte, 1885, 1 Abt., Heft 5-10 ; H Abt., Heft 4-1 ; IH Abt., Heft 

 3, 5-8, 10. '86, I Abt., Heft 1-2 ; II Abt., Heft 1-2; and 



Almanacli, 1886. 



The Cliairman continued tbe reading of his observations upon 

 the Earthquake. * 



Mr. F. W. Schlepegrell read a paper on " Some Electrical Dis- 

 turbances during the Earthquake." * 



Dr. MANiGAUiiT having recently returned from a visit to Washington, where 

 he met several of the officers of the Geological Survey, stated verbally, that 

 Captain C. E. Dutton informed him that the results of the investigations of 

 Mr. Sloan, who was commissioned to make observations upon the earthquake 

 phenomena at Charleston, Summer ville, and the country around, were that 

 three loci of vertical movements or thrusts were now considered as having been 

 clearly defined in the area severely affected. 



The first was between Mount Holly Station on the North Eastern K. E. and 

 Ladson's on the S. C. Railway — the second was on both sides of the Ashley Ri- 

 ver in the neighborhood of Middleton Place, and the third at Rantowles' on 

 the Stono River, about ten miles from Charleston. The surface waves which 

 spread from these three centres where the thrusts were vertical may have been 

 the cause of the contradictory opinions as to the direction from which the 

 shocks came, and it is also possible that, as the waves reached the harbor, the 

 sounds parted from the wave movement and reverberated from the opposite 

 shores, thus producing absolute confusion as to direction. 



Dr. Manigault expressed the opinion that the greatest injury done to the 

 lower part of the City was by wave movement exclusively, which caused 

 everj' kind of building to sway or rock backwards and forwards, including the 

 steeples of churches, and that, although there may have been destructive waves 

 from all three of the hci, causing contradictory opinions in some few cases, the 

 most destructive waves to buildings South of a line running East and West 

 through Cumberland St., were from the Westward. He mentioned several 

 buildings as evidences of this direction from which the force came, especially 

 the porch of the Medical College, the porches of the Hibernian Hall, St. Mi- 

 chael's Church, South Cai'olina Hall and Scotch Presbyterian Church. 



His reasons for being of this opinion were that the earthwaves which passed 

 under his feet while standing in his garden, before the great shock was over, 

 moved towards three brick houses in Legare St., numbers 8, 10, and 12, and it 

 is therefore natui-al to conclude that the waves which he felt were the same 

 that did the damage to those three houses. The direction of those waves was 



* Referred to tlie Coinmission appointed Sopt. 23d, 1SS6. . 



